The typical asking rate per listing is in the $40's per square foot per year. The Castro Valley submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $44 per sqft per year.
Compared to the rest of the East Bay market, the Castro Valley submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 0 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the office spaces in the Castro Valley are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,400 sqft. Most buildings in this area are around 1 stories. Most buildings in this region were built in 1982.